EP3885604A1 - Piston dérouleur à ressort pneumatique - Google Patents

Piston dérouleur à ressort pneumatique Download PDF

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Publication number
EP3885604A1
EP3885604A1 EP21159454.4A EP21159454A EP3885604A1 EP 3885604 A1 EP3885604 A1 EP 3885604A1 EP 21159454 A EP21159454 A EP 21159454A EP 3885604 A1 EP3885604 A1 EP 3885604A1
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EP
European Patent Office
Prior art keywords
rolling piston
piston
stiffening elements
stiffening
rolling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21159454.4A
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German (de)
English (en)
Inventor
Andreas Sabathil
Marcel Ogris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAN Truck and Bus SE
Original Assignee
MAN Truck and Bus SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MAN Truck and Bus SE filed Critical MAN Truck and Bus SE
Publication of EP3885604A1 publication Critical patent/EP3885604A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/05—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type
    • F16F9/052—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type characterised by the bumper

Definitions

  • the invention relates to a roll-off bellows for an air spring bellows of an air spring.
  • the invention also relates to an air spring and a motor vehicle with a rolling bellows of this type.
  • the motor vehicle can be a utility vehicle, such as an omnibus or a truck.
  • Air suspension systems are increasingly being used in motor vehicles for increased driving comfort and for level control.
  • the spring function is implemented by a pneumatically controlled air bellows that rolls on a rolling piston.
  • high static and dynamic loads act on the rolling piston.
  • a combination of high stress and component-specific requirements creates challenges with regard to the design and manufacture of these components.
  • the document DE 10 2007 035 640 A1 describes a plunger for an air spring, which is designed as a hollow body and has a base to which a circumferential casing part is directly or indirectly coupled, and which has a connection edge for a bellows and at least one air passage opening on its cover area facing away from the base.
  • the hollow body has a pot-shaped lower part which forms the base and the casing part, an upper part being placed on the lower part and being connected to the lower part in an airtight manner.
  • the lower part and / or the upper part are stiffened by means of stiffening elements.
  • the document WO 2013/053536 A1 discloses a rolling piston made of plastic for an air spring rolling bellows, the rolling piston being designed as a plunger.
  • An advantageous one The embodiment consists in that the interior of the rolling piston is stiffened with rib-like stiffening elements, which can also absorb transverse forces or obliquely acting buffer forces. With such a design, the wall thickness of the tubular support parts can optionally be further reduced. This effect is further increased by the fact that the rib-like stiffening elements are arranged in a star-shaped or radiant manner and that rib-like stiffening elements are also provided in the annular spaces between the respective support part and the piston wall or cover wall.
  • the object of the present invention is to provide a rolling piston with which the disadvantages of known rolling pistons can be avoided.
  • the object of the invention is, in particular, to improve the plunger pistons known from practice with regard to strength.
  • a rolling piston for an air spring roll bellows of an air spring is provided.
  • the rolling piston is stiffened by means of stiffening elements that extend radially at least in sections.
  • the rolling piston is preferably designed as a plunger piston.
  • the stiffening elements can be designed, for example, as walls or ribs and extend at least in sections radially or essentially radially outward from the center or a central inner region of the roll-off piston.
  • the radial direction is understood to mean a direction which is perpendicular to the rolling direction of the rolling piston.
  • At least one of the stiffening elements has at least one branch point at which the stiffening element branches or forks into at least two stiffening element branches.
  • at least one stiffening element divides into at least two stiffening element branches at at least one branching point, which branches in turn can optionally branch.
  • the rolling piston has a stiffening structure extending in the radial direction and thereby branching or branch-shaped.
  • the one resulting from the stiffening elements, the forks or branches and the stiffening element branches Structure can e.g. B. bionic, ie preferably occurring in living nature, correspond to or modeled on structures.
  • the proposed rolling piston offers advantages over the known solutions with regard to a particularly high load capacity, in particular in connection with the production of the rolling piston from plastic, since in this way a component with low weight but high load capacity is made possible in a cost-effective manner. At least part of the axial and radial load acting on the rolling piston is absorbed and diverted via the stiffening element branches and stiffening elements.
  • the proposed rolling piston thus has an increased load capacity in the radial and / or axial direction compared to known solutions.
  • the branching stiffening structure represents an advantageous suitability for manufacture with an injection molding process. This is because the structure of stiffening elements, forks or branches and stiffening element branches can also serve as a guide channel for the melted casting material during the manufacturing process.
  • the stiffening elements can extend radially outward from a central inner region of the rolling piston. Furthermore, at least a plurality of the stiffening elements can branch out at least once, optionally multiple times. This can improve the stiffening effect.
  • the structure resulting from the branching stiffening structure is bionic, i.e. H. preferably occurring in living nature, corresponds to structures or can be modeled on them.
  • the stiffening elements can form a structure which corresponds to or is modeled on a structure of a leaf underside of the water lily Victoria cruziana.
  • the rolling piston is particularly effectively stiffened in this way by the stiffening elements, because the loaded surface of the rolling piston is divided into several small units, preferably each of a similar size, by the structure of stiffening elements. This has further advantages with regard to the strength of the rolling piston.
  • At least some of the branch points of different stiffening elements can be arranged offset from one another in the radial direction.
  • the stiffening effect of the stiffening elements thus extends more advantageously Way not only in a single, but several radial positions of the rolling piston and can be adapted to the load conditions as required.
  • a branching or bifurcation angle between the stiffening element branches can decrease when the stiffening element branches extend away from the branching point.
  • At least one of the stiffening element branches, preferably both or all stiffening element branches, of a branch point can have a curvature or a kink in order to reduce the branching or bifurcation angle between the stiffening element branches when the stiffening element branches extend away from the branch point .
  • the branching or bifurcation angle between the stiffening element branches can decrease if the stiffening element branches extend away from the branching point. This has the advantage of a smooth force deflection or reduction of the notch effect at the branch points.
  • a wall thickness of the stiffening elements can vary.
  • the wall thickness can preferably decrease radially outward. This has advantages in terms of the cost and weight of the rolling piston.
  • the stiffening elements can be connected in one piece to an inner region of the rolling piston and in one piece to an outer region of the rolling piston.
  • the rolling piston is therefore particularly easy to manufacture.
  • stiffening elements extending radially at least in sections are supported by one or more stiffening elements extending in the circumferential direction.
  • the stiffening elements extending radially at least in sections can also be referred to as first stiffening elements for better differentiation from the plurality of stiffening elements extending in the circumferential direction, which can also be referred to as second stiffening elements.
  • the rolling piston can have second stiffening elements running essentially in the shape of a segment of a circle, which are each connected in one piece to two adjacent stiffening elements that extend radially at least in sections or to two adjacent stiffening element branches (first stiffening elements).
  • second stiffening elements running essentially in the shape of a segment of a circle, which are each connected in one piece to two adjacent stiffening elements that extend radially at least in sections or to two adjacent stiffening element branches (first stiffening elements).
  • first stiffening elements there is an additional stiffening effect between adjacent stiffening elements or adjacent stiffening element branches.
  • the rolling piston can be designed as an injection molded part, preferably as a plastic injection molded part, more preferably made of glass fiber reinforced plastic.
  • the rolling piston can be produced by means of a 3D printing process, preferably additive layer manufacturing.
  • the rolling piston can be designed as a hollow body, an interior of the rolling piston being stiffened by means of the stiffening elements extending radially at least in sections.
  • the interior of the rolling piston is thus used in an advantageous manner as a spring volume, while at the same time a high load capacity can be guaranteed.
  • the rolling piston can have a piston lower part and a piston upper part.
  • the lower piston part can have the stiffening elements, as described above.
  • the upper piston part can have the stiffening elements, as described above.
  • the rolling piston can comprise a pot-shaped, cylindrical and / or tubular lower piston part and an upper piston part connected airtight to the lower piston part and designed as a cover, the lower piston part and / or the upper piston part being stiffened by means of the at least partially radially extending stiffening elements.
  • the structural design and the manufacturability of the rolling piston are thereby further simplified.
  • the stiffening elements of the piston lower part can extend in the radial section of the air spring rolling piston over the entire height of the interior of the piston lower part, and / or the piston upper part can have a connecting edge for an air spring rolling bellows.
  • the invention also relates to an air spring comprising a rolling piston as described in this document.
  • the invention also relates to a motor vehicle comprising a rolling piston or an air spring as described in this document.
  • the motor vehicle is preferably a utility vehicle.
  • the motor vehicle can be a motor vehicle whose design and device are designed to transport people, transport goods or pull trailers.
  • the motor vehicle can be a truck, an omnibus and / or an articulated truck.
  • Figure 1 shows a rolling piston 1 according to an embodiment in an isometric view.
  • the rolling piston 1 shown is designed as a plunger for an air spring roll bellows (not shown) of an air spring (not shown).
  • the air spring rolling bellows can be slipped over the rolling piston 1 and connected to the rolling piston 1 in an airtight manner.
  • the air spring roll bellows can roll on the rolling piston 1 in a likewise known manner.
  • the rolling piston 1 is thereby loaded axially and radially.
  • the rolling piston 1 comprises a pot-shaped lower piston part 11 and an upper piston part (not shown) that is connected to the lower piston part 11 in an airtight manner and is designed as a cover.
  • the rolling piston 1 can alternatively or additionally also be cylindrical and / or tubular.
  • the piston lower part 11 of the rolling piston 1 is designed as a hollow body and stiffened with eight stiffening elements 2 extending radially at least in sections. However, fewer stiffening elements 2 or additional stiffening elements 2 can also be provided.
  • the stiffening elements 2 form walls or ribs in the interior of the piston lower part 11 of the rolling piston 1.
  • the stiffening elements 2 of the piston lower part extend in the radial section of the rolling piston 1 over the entire height of the interior of the piston lower part.
  • the upper piston part (not shown) can alternatively or additionally also be stiffened with stiffening elements 2 extending radially at least in sections and have a connecting edge for an air spring roll bellows.
  • the rolling piston 1 is designed as a plastic injection-molded part and is made from glass fiber reinforced plastic.
  • the rolling piston 1 can be produced by means of a 3D printing process, preferably additive layer manufacturing.
  • the stiffening elements 2 each have a branch point 3 at which each stiffening element 2 branches or forks into two stiffening element branches 4, 5. However, only some of the stiffening elements 2 can have said branch point 3. Furthermore, it is possible that the branching elements 2 branch or fork into more than two stiffening element branches 4, 5.
  • Figure 2 shows the rolling piston according to the embodiment described above in plan view. It can be seen that the stiffening elements 2 extend radially outward from a central inner region 6 of the rolling piston 1, and the stiffening elements extend 2 branch once. In further embodiments (not shown), a larger or smaller number of branching elements 2 and / or branching points 3 is possible.
  • stiffening elements 2 form a structure that one, in Figure 6 exemplified, the structure of a leaf underside of the water lily Victoria cruziana corresponds to or is modeled on.
  • the stiffening elements 2 are connected in one piece to an inner region 6 of the rolling piston 1 and in one piece to an outer region 9 of the rolling piston 1.
  • the rolling piston 1 has further stiffening elements 10 which run essentially in the shape of a segment of a circle and which are connected in the region of the curvature or the kink 8 of the stiffening element branches 4, 5 in one piece to two adjacent stiffening elements 2 that extend radially at least in sections or to two adjacent stiffening element branches 4, 5.
  • the stiffening elements 10 running in the shape of a segment of a circle run essentially in the circumferential or tangential direction of the cup-shaped lower piston part 11 of the rolling piston 1 and, taken together, form a circular structure.
  • branch points 3 on the branch elements 2 are each arranged at the same radial height, but according to further embodiments (not shown) it is also possible that at least some of the branch points 3 of different stiffening elements 2 are arranged offset from one another in the radial direction.
  • Figure 3 shows a schematic representation of a stiffening element 2 of the rolling piston of the embodiment described above, forked into two stiffening element branches 4, 5, in plan view.
  • stiffening element branches 4 enclose a branching or fork angle 7. Both stiffening element branches 4, 5 of the branch point 3 have a kink 8 in order to reduce the branching or fork angle 7 between the stiffening element branches 4, 5 when the stiffening element branches 4, 5 extend away from the branch point 3. Furthermore, the wall thickness of the stiffening elements 2 increases radially outwards, d. H. to the right in the view shown.
  • Figures 4 and 5 show the rolling piston according to the embodiment described above additionally in the side or bottom view.
  • the Figure 6 shows an example of a water lily structure on the underside of the leaf of a water lily Victoria cruziana.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP21159454.4A 2020-03-18 2021-02-26 Piston dérouleur à ressort pneumatique Pending EP3885604A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020001798.3A DE102020001798A1 (de) 2020-03-18 2020-03-18 Luftfederabrollkolben

Publications (1)

Publication Number Publication Date
EP3885604A1 true EP3885604A1 (fr) 2021-09-29

Family

ID=74797734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21159454.4A Pending EP3885604A1 (fr) 2020-03-18 2021-02-26 Piston dérouleur à ressort pneumatique

Country Status (2)

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EP (1) EP3885604A1 (fr)
DE (1) DE102020001798A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647795A1 (fr) * 1993-10-11 1995-04-12 Psa Sistemi Antivibranti S.P.A. Piston pour ressorts pneumatiques, notamment pour les suspensions de véhicules
DE102007035640A1 (de) 2007-07-27 2009-01-29 Lkh-Kunststoffwerk Gmbh & Co. Kg Tauchkolben
DE102011050103A1 (de) * 2011-05-04 2012-11-08 Contitech Luftfedersysteme Gmbh Abrollkolben für einen Luftfederrollbalg
DE102011051237A1 (de) * 2011-06-21 2012-12-27 Contitech Luftfedersysteme Gmbh Abrollkolben für einen Luftfederrollbalg
WO2013053536A1 (fr) 2011-10-10 2013-04-18 Contitech Luftfedersysteme Gmbh Piston roulant pour un soufflet à ressort pneumatique
WO2016090214A1 (fr) * 2014-12-04 2016-06-09 Firestone Industrial Products Company, Llc Configuration de piston à robustesse latérale accrue
US20190031314A1 (en) * 2014-10-16 2019-01-31 Airbus Operations Gmbh Panel structure and associcated method
DE102018216989A1 (de) * 2017-10-04 2019-04-04 Continental Teves Ag & Co. Ohg Druckkörper für ein Druckluftsystem

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2886448B1 (fr) 2013-12-20 2017-03-08 Airbus Operations GmbH Élément porteur de charge et procédé de fabrication dudit élément

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647795A1 (fr) * 1993-10-11 1995-04-12 Psa Sistemi Antivibranti S.P.A. Piston pour ressorts pneumatiques, notamment pour les suspensions de véhicules
DE102007035640A1 (de) 2007-07-27 2009-01-29 Lkh-Kunststoffwerk Gmbh & Co. Kg Tauchkolben
DE102011050103A1 (de) * 2011-05-04 2012-11-08 Contitech Luftfedersysteme Gmbh Abrollkolben für einen Luftfederrollbalg
DE102011051237A1 (de) * 2011-06-21 2012-12-27 Contitech Luftfedersysteme Gmbh Abrollkolben für einen Luftfederrollbalg
WO2013053536A1 (fr) 2011-10-10 2013-04-18 Contitech Luftfedersysteme Gmbh Piston roulant pour un soufflet à ressort pneumatique
US20190031314A1 (en) * 2014-10-16 2019-01-31 Airbus Operations Gmbh Panel structure and associcated method
WO2016090214A1 (fr) * 2014-12-04 2016-06-09 Firestone Industrial Products Company, Llc Configuration de piston à robustesse latérale accrue
DE102018216989A1 (de) * 2017-10-04 2019-04-04 Continental Teves Ag & Co. Ohg Druckkörper für ein Druckluftsystem

Also Published As

Publication number Publication date
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